JPS5841387A - Device for feeding control rod driving water - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control rod drive water supply device that supplies water for driving, swelling, and cooling to a control rod drive mechanism of a nuclear reactor.

A plurality of control rods with a neutron absorption function are arranged in the core of the reactor pressure vessel, and each control rod is driven by a control rod drive mechanism to insert or withdraw from the reactor core to control the reactor output. It is configured. Furthermore, in the event of an emergency, all O control rods are configured to be inserted in an emergency manner to bring the reactor to a halt.

The control rod drive mechanism has a drive piston connected to the control rod in a cylinder, and is configured to drive the piston by hydraulic pressure to insert or withdraw the control rod.

Pressure water is supplied to the control rod drive mechanism by a control rod drive water supply device. In addition, in order to prevent the control rod drive mechanism from overheating, the control rod drive water supply device constantly supplies cooling water.

By the way, foreign matter may get mixed into the flow path of the piping system of the control rod drive water supply device. If such foreign matter gets mixed into the cooling water, it will have a big effect because the cooling water always flows into the control rod drive mechanism, for example, it could clog the orifice in the drive mechanism and cause the drive mechanism to malfunction. In addition, there is a risk that the sealing parts within the drive mechanism may be damaged, leading to the shutdown of the nuclear reactor and reducing the operating rate.

The present invention was made based on these circumstances, and
Its purpose is to provide cooling water that constantly supplies cooling water to the control rod drive mechanism in the control rod drive water supply system that supplies water for driving, scram, and cooling to the control rod drive mechanism of the reactor. A filter is inserted in the piping system to prevent clogging of the orifice in the drive mechanism and damage to the seal part, thereby maintaining the integrity of the reactor and improving the operating rate of the reactor. There is K.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, 1 is a water supply source, and this water supply source 1 is connected to a master control unit 5-1)x via a pump J. The master control unit 3 of Jin is used to adjust the pressure of water sent out from the water supply source 1 in four ways. To the 4 books, goo 5.6. '1.8 is connected so that each header sends out water at a different pressure. A scram piping system 9, a drive piping system 10, a cooling piping system 11, and a return piping system 12 are connected to each goo 6.6° 7.8, corresponding to each control rod drive mechanism 4. has been done.

First, the scram piping system t is constructed by connecting a mullet 14 for storing high-pressure water to the first pipe 5 via a check valve 11.

The drive piping system 10 also connects a check valve 16 to the second goo C through a filter 15, and connects a control rod drive mechanism to the outlet side of the check valve 16 through an electromagnetic switching valve 11. The insertion pipe 1# connects to the insertion side water supply nozzle 11 of No. 4, and the extraction side water supply nozzle 2 of the control rod drive mechanism 4 via the solenoid valve 20.
1 is connected to the drawn piping 22 connected to 1.

Further, the cooling piping system 11 connects a check valve 24 to the third end 7 via a filter 23.
The outlet side of the insertion pipe 19 is connected to the middle of the insertion pipe 19.

Note that a scram inlet valve 2j is connected between each outlet side of the check valve 18.24.

The return piping system 12 connects the filter 2 to the fourth goo 8.
A branch pipe 2 connected to the middle of the insertion pipe 1- via #
r and a branch pipe 2a that is connected in the middle of the drawn pipe 22, one of the branch pipes 21 is equipped with an electromagnetic switching valve 29 and a filter 3#, and the other branch pipe 28 is equipped with an electromagnetic switching valve. 31 and a filter 32 are inserted therein.

Note that there is a scram outlet valve J in the middle of the drawn pipe 22.
2AN output head via J and check valve J4
A stalum discharge pipe 3C is connected.

Next, the operation of this embodiment will be explained.

The water sent out by the water supply source l and the pump 2 is the master control unit Jf4! 5.6. sent to fl, l.

First, water in the first header 5 is stored as high-pressure water in the accumulator 14 through the check valve IJ of the scram piping system 9.

To the third stage, the water in the goo 1 passes through the filter 2J and check valve 24 of the cooling piping system 11, and then passes through the drive piping system 1.
The water is introduced into the insertion side water supply nozzle II of the control rod drive mechanism 4 through a part of the water supply nozzle II, cools the outer circumferential surface of the cylinder j# through the orifice 31, and flows into the reactor pressure vessel 39.

Further, in order to insert the control rod 40 during normal operation, the electromagnetic switching valves 17 and 11 are respectively opened. Therefore, the pressure water in the header 6 of 182 passes through the filter 15, check valve 16, and switching valve 11 of the drive piping system 10, and enters the insertion piping 1# through the insertion side water supply nozzle 1g of the control rod drive mechanism 4. It flows into the space below the drive piston 41 in the cylinder 38, pushes the drive piston 41 upward, and inserts the control rod 40 connected thereto. Also, the drive piston 41 inside the cylinder 38
Upper surface @O water flows out from the water supply nozzle 21 on the extraction side, the extraction piping 22, the filter 32 of the return piping system 12, and the electromagnetic switching valve 1.
1 and filter 26 and return to the fourth hemlock 1?
, flows into the third header 1 via the master control unit J.

In order to withdraw the control rod 40 during normal operation, the electromagnetic switching valves 20 and 29 are opened. Therefore, the pressurized water in the goo 6 is transferred to the second pipe through the filter 15, check valve IC, and switching valve 20 of the drive piping system 10, the withdrawal pipe 22, the withdrawal side water supply nozzle 21 of the control rod drive mechanism 4, and the inside thereof. The upper piston 41 of the drive piston 41 in the cylinder 38 is pushed down and connected to the upper piston 41,
゛) Pull out the control rod 40 that has been removed. Also, cylinder 5s
P3o dry! The water on the lower surface of the piston 4 flows out through the insertion side water supply nozzle 1#, passes through the insertion pipe 19, the filter 3σ of the return piping system I2, the electromagnetic switching valve 2I and the filter 26, and returns to the fourth pipe and the goo 1. It flows through the master control unit 1 into the third and third channels.

Next, K performs an emergency insertion operation of the control rod 40 in an emergency.
opens the scram population valve J5 and the scram outlet valve 33. Therefore, the high-pressure water stored in the mullet 14 flows into the interior from the insertion side water supply nozzle 18 of the control rod drive mechanism 4 through the scram population valve 26 and the insertion pipe 19, and flows into the inside of the control rod drive mechanism 4 from the insertion side water supply nozzle 18, flows into the side space and pushes the drive piston 41 upward,
The control rod 40 is operated for emergency insertion. Also, Siri/Me J8
The water on the upper surface side of the inner O2 igu piston 41 flows out through the withdrawal side water supply nozzle 21 and passes through the withdrawal pipe 21), and further through the scram outlet valve 3S and check valve 34 in the scram discharge pipe 35.
Goo J5 is then discharged.

According to the control rod-driven water supply device configured as described above,
A solenoid switching valve I is provided in the drive piping system 10 and the return piping system 12.
Filter 15. to protect T, 20.29.21.
2g, 30.

32, these piping systems 10, 1
If a foreign object gets mixed into the water inside the control rod drive mechanism 4, the foreign object will be captured by one of the 74 lumens and will not enter the control rod drive mechanism 4. 9. Cooling piping system 1
1 is provided with a filter jJ, so if foreign matter gets into the water in this piping system 11, the foreign matter will be captured by the filter 23, and the control rod drive horizontal structure 4
Intrusion of foreign matter into the interior is prevented.

Therefore, there is no risk of clogging of the orifice 310 in the control rod drive mechanism 4, damage to seal parts, etc., and it is possible to maintain the integrity of the reactor and improve the operating rate.

In addition, in the above embodiment, the filter 21 of the cooling piping system 11
is inserted on the upstream side of the check valve 24, but it may be inserted on the downstream side of the check valve 24 as shown by the imaginary line jJ' in the figure, or the cooling It may be inserted into the 30th header r to which the piping system 11 is connected.
Furthermore, when these filters xs, is' are inserted into the header 1, it is possible to eliminate the trouble of separately providing each of the plurality of control rod drive mechanisms.

23# may be used in combination.

As detailed above, according to the control rod drive water supply device of the present invention, the control rod drive mechanism can be controlled by inserting a filter into the cooling piping system that constantly supplies cooling water into the control rod drive mechanism. It is possible to prevent clogging υ of the orifice in the rod drive mechanism, damage to seal parts, etc., and it is possible to maintain the reactor O health and improve the operating rate of the reactor.

[Brief explanation of drawings]

The drawing is a system diagram of a control rod-driven water supply device in one embodiment of the present invention. 1...k water source, 2-#f, J...master control unit)%4"" control rod drive mechanism, 5°6.7.
8... Spatula finish, 9... Scram piping system, 10...
Drive piping system, 11-Cooling piping system, 12-Return piping system, IT, 20.29.11...Solenoid switching valve, 18--
Insertion side water supply nozzle, 21... Retraction side water supply nozzle, jJ
-・Filter.

Claims (2)

[Claims] (1) The i-star control unit, which adjusts the pressure of water sent out from the water supply source in multiple ways, has multiple drive piping systems connected to this master control unit, and the i-star control unit and controller. A scram piping system that supplies high-pressure water that is sent out and stored in the mulator to the water supply nozzle on the insertion side of the control rod drive mechanism 0 through a part of the drive piping in an emergency, and a scram piping system that connects to the master control unit and connects the control rods. The logs discharged from the water supply nozzle on the insertion side or extraction side of the drive mechanism are passed through a part of the drive piping and a plurality of switching valves.
a cooling piping system that is connected to the master control unit and constantly supplies water for cooling the rods into the control rod drive mechanism through a part of the drive piping system;
9. A control rod drive water supply device comprising: a filter inserted into an O cooling piping system. (2) a header K to which each piping system is connected to the master control unit via a terminal and to which the cooling piping system is connected, so that each piping system is shared by a plurality of control rod drive mechanisms;
The control rod drive water supply device according to claim (1), characterized in that a filter shared by the plurality of control rod drive mechanisms is inserted.